3/8"-24 Nuts | McMaster-Carr

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Hex Nut Profile

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Cadmium Yellow-Chromate Plated

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Metric Rounded Trapezoidal

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Unified Standard Class 2A

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DFARS Specialty Metals

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1C998

2B999

EAR99

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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603 Products

Fastening and Joining

Hex Nuts

Handle most general fastening needs

60 products

Locknuts

Hold fasteners in place to prevent loosening from vibration

44 products

Flange Nuts

The flange distributes pressure, so you don't need a washer

24 products

Coupling Nuts

Connect and extend threaded rods

19 products

Cap Nuts

Cover and protect threads while adding a finished look; also known as acorn nuts

12 products

Square Nuts

Flat sides won’t spin in channels and square holes

1 product

Thumb Nuts

Easy to tighten and loosen by hand for making frequent adjustments

7 products

Socket Nuts

Install in recessed holes and tight spots where a wrench won’t fit; also known as Allen nuts

2 products

Sealing Nuts

Prevent leaks and block out contaminants with a rubber seal

2 products

Tamper-Resistant Nuts

Hard to detach without special tools to prevent unwanted removal

3 products

Weld Nuts

Weld to metal surfaces to add permanent threads

29 products

Rivet-Mount Nuts

Add threads in hard-to-reach areas and materials that are too thin to be tapped

2 products

Push Nuts

Press onto threads for a light duty hold that’s faster to install than typical nuts

1 product

Press-Fit Nuts

Push into drilled or punched holes to add threads to thin panels

3 products

Rivet Nuts

Add threads to thin panels with access from only one side; also known as blind inserts

6 products

Threaded Inserts

Create new threads or repair stripped threads

97 products

Thread Adapters

Join threads of a different type, size, and gender

Turn fasteners with an external drive style without slipping and damaging the drive

1 product

Fluid Handling

Tube and Tube Fittings

Typically more flexible than pipe for carrying liquids and gases in short runs around equipment

6 products

Hose and Hose Fittings

Flexible and stronger than tubing; often used to convey liquids and gases under pressure

4 products

Hose Crimpers

Crimp ferrules onto hose to secure fittings

1 product

Power Transmission

Lead Screw Collars

Position components and limit travel along a lead screw

2 products

Precision Lead Screw Nuts

Pair with precision lead screws for accurate starts and stops in your assembly

5 products

Building and Machinery Hardware

Handle Nuts

Attach to threaded shafts to quickly turn the shafts by hand

3 products

Material Handling

Turnbuckle Bodies

Pair with end fittings to create a custom turnbuckle

1 product